Vehicle-operated lift



1929. M. EHRICKE 1,723,686

VEHICLE OPERATED LIFT Filed Dec. 9, 1926 lnvenfar:

MM W

Patented Aug. 6, 1929.

UNITED STATES PATENT orrlcs.

MAX EHBIGKE, OF IiEIPSIC-ILAGWI'IZ, GERMANY, ABSIGNOB TO THE FIRM: BUDOLI' BACK, OF LEIPSIC-PLAGWITZ,.GERMANY.

VEHICLE-OPERATED LIFT.

Application filed December 9, 1928, Serial 110. 153,684, and in Germany August 18, 1926.

My invention relates to tractors and more especially to means for supporting on a tractor an agricultural implement, a culti 7 engaged with a vator, a plough ortthe' like so as to move the implement into operative posit on by lowering it and to render it inact ve. by elevating it. Y I

- It has alreadybeen proposed to elevate implements of the'kind describedthrou h the medium of the tractive effort exerted y I a tractor and my invention relatesto means operatin on the same princlplejbut it is an object o my invention to replace the mechanisms which have already been for this object by a mechanism whic 1s more simple than the aforesaid. mechanisms and at the same time performs all the func tions required.

To this end I 'provideja part which may be a double-armed lever fulcrumed on the frame. of the tractor, and connect one arm to the lever with the implement while the other arm is provided with a rack fulcrumed thereon. This rack is adapted to temporarily engage a gear wheel .on the driving wheel whereupon the implement/is elevated by-the tractive effort. A pawl is provided for locking the arm in the posi-- tion in which the implement is elevated, and means are connected with the rack for con trolling the pawl so as to throw it out of its locking position. i

In the drawings affixed to this specification and forming part thereof a device embodying my invention is illustrated diagrammatically by way of example.

In the drawings Fig. 1 is a cross-section, and

Fig. 2 is a plan view of the driving axle and wheel of the tractor, the parts being shown in the position in which the plough or other implement is lifted free of the ground.

Referring to the drawin s, 1 is a drawbar which is attached to t e frame of the tractor by any suitable means, not shown. The only part of the tractor frame which has been illustrated, is the axle tube for the driving wheels 20, 20. Supported on'the tube in bearings 4, 4 is the shaft 3 of a double-armed lever 2-, 5. The implement, not shown, is suspended from the arm 2 as indicated by the arrow in Fig. 1. The other arm 5 is provided with a pin 6 adapted to be engaged by a pawl 7. This pawl is fulcrumed at 9 on a bracket 11 gear wheel 21,

roposed operative 10. 8 is a spring-tending to hold the pawl pin 6. 12 is a pivot on the arm 5 on which a handle 13 is adapted to rock. The handle at; its lower .end is provided with a rack 19-adapted to temporarily engage a gear wheel 21 on one of the driving wheels 20. 22 is a block on the rack whichwhen en aged by'the teeth of the throws the rack out of mesh with the wheel. 16'is a sector formed on the arm 5, 15 is a catch adapted to engage a notch in the sector and 17 is a lever for operating the'catch' 15. '14 is a dog on the handle 13 which is adapted to engage a curved race 18 on the pawl 7. I In theposition illustrated in Fig. 1, the implement has been elevated and the arm 5 has been locked by the pawl 7. Whernit is desired to lower the implement, the handle 13 is rotated in the direction of the arrow, Fig. 1. This causes the dog 14 to engage the race 18 on the awl 7 so that the pawl releases the pin 16. he weight of the implement acting in the direction of the arrow at the end of the arm 2 pulls down the arm so that the implement moves into osition by avity. The pin 6 slides on t e race 18 o' the pawl 7 against the action of the spring 8.

When it is desired to elevate the implement, the handle 13 is moved in o posits direction to the arrow in Fig. 1, so-t at the rack 19 is engaged by the gear wheel 21. This causes the arm 5 to be pulled down while the arm 2 is elevated. When the arm 5 has returned into the position illustrated, it is locked by the in 6 which has now slid off the race 18. T e dog 14 does not interfere as it is out of reach of the race 18 as long as the ear Wheel is meshing with the rack19. en the arm 5 has been locked by the pawl 7, the block 22 is engaged by the teeth of the ear wheel 21, throwing the rack 19 out 0% mesh with the teeth so that the rack 19 no longer exerts a downward 1111 on the lever 5.

I WlSh it to be understood that I do not desire to be limited to the exact details of construction shown and described for obvious modifications will occur to a person skilled in the art.

I claim 2- 1. A tractor com ame, a part fulcrumed l on said frame and adapted to displace an tural imp agricultural implement with respect to said frame, a gear wheel on said driving wheel, a rack fulcrumed .on said part and adapted to temporarily engage said gear wheel for moving said part so as to elevate said implement, a pawl for locking said part in the position in which the implement is elevated,

and means operatively connected with said rack for controlling said pawl.

2. A tractor comprising a frame, a driving wheel on said frame, a d0uble-armed lever fulcrumed on said frame, one arm of said lever being adapted to support an agricultural implement, a rack fulcrumed on the other arm of said lever, a gear wheel operatively connected with said driving wheel and adapted to be temporarily engaged by said rack, a pin on said double-armed lever, and a pawl fulcrumed on said frame and ada ted to engage said pin so as to hold the implement-supporting arm of said lever in elevated position.

3. A tractor comprising a frame, a driving wheel on said frame, a double armed lever fulcrumed on said frame, one arm of said lever bein adapted tosu port an agricul- Fement, a rack ulcrumed on the other arm of said lever, a gear wheel operatively connected with said driving wheel and'adapted to be temporarily engaged by said rack, a pin on said double-armed lever, a pawl fulcrumed on said frame and adapted to engage said pin so as to hold the imple-' merit-supporting arm of said lever. in elevated position, and means on said rack for disengaging said pawl from said pin.

4. A tractor comprising a frame, a driving wheel on said frame, a double-armed lever fulcrumed on said frame, one arm of said lever being adapted to support an agricultural implement, a rack fulcrumed on the other arm of said lever, a gear wheel operatively connected with said driving wheel and adapted to be temporarily engaged by said rack, a handle connected with said rac means for securing said handle in a definite position with respect to said arm on which it is pivoted, a in on said doublearmed lever, a pawl ulcrumed on said frame and adapted to engage said pin so as to holdthe implement-supporting arm of said lever in elevated position, and a dog on said handle adapted to disengage said pawl from said pin.

' In testimony whereof I afiix my signature.

MAX EHRICKE. 

